Cosmetic and dermatological light protection formulations with a content of hydroxybenzophenones and alkylnaphthalates

ABSTRACT

The invention relates to light-protective cosmetic or dermatological preparations that contain (a) at least one hydroxy-benzophenone, and (b) at last one dialkyl naphthalate of the structural formula (1), wherein R 1  and R 2  are independently selected form the group of the branched and unbranched alkyl groups that have 6 to 24 carbon atoms. The invention further relates to the use of said formulations.

The present invention relates to cosmetic and dermatological light protection preparations.

The harmful effect on the skin of the ultraviolet part of the sun's radiation is generally known. Depending on their respective wavelength, the rays have different effects on the organ skin: so-called UVC radiation, with a wavelength that is less than 290 nm, is absorbed by the ozone layer in the earth's atmosphere and therefore has no physiological significance. In contrast, rays in the range between 290 nm and 320 nm, the so-called UVB range, cause an erythema, a simple sunburn or even more or less severe bums. The narrower range around 308 nm is given as a maximum of the erythema effectiveness of sunlight.

Numerous compounds are known for protection from UVB radiation, which compounds are, e.g., derivatives of 3-benzylidenecamphor, 4-aminobenzoic acid, cinnamic acid, salicylic acid, benzophenone and triazine.

It had long been wrongly assumed that long-wave UVA radiation with a wavelength between 320 nm and 400 nm has only a negligible biological effect. However, it has since been proven through numerous studies that UVA radiation is much more dangerous than UVB radiation with respect to triggering photodynamic, in particular phototoxic, reactions and chronic changes in the skin. The harmful effect of the UVB radiation can also be further increased by UVA radiation.

It is thus proven, i.a., that even UVA radiation under quite normal everyday conditions is sufficient to damage within a short time the collagen and elastin fibers that are of substantial importance for the structure and strength of the skin. This causes chronic light-related changes to the skin—the skin “ages” prematurely. The clinical picture of skin aged by light includes, e.g., wrinkles and small lines and an irregular furrowed relief. Furthermore, the parts affected by light-related skin aging can exhibit an irregular pigmentation. Also the formation of brown spots, keratoses and even carcinomas or malignant melanomas is possible. Moreover, skin prematurely aged through everyday UV exposure is characterized by a lower activity of the Langerhans' cells and a slight chronic inflammation.

Approximately 90% of the ultraviolet radiation reaching the earth is composed of UVA rays. Whereas UVB radiation varies greatly depending on numerous factors (e.g., time of year and time of day or degree of latitude), UVA radiation remains relatively constant day to day, regardless of the times of year or times of day or geographical factors. At the same time, most of the UVA radiation penetrates the live epidermis, whereas about 70% of UVB rays are stopped by the horny layer of the epidermis.

It is therefore of fundamental importance for cosmetic and dermatological light protection preparations to provide adequate protection from both UVB and UVA radiation.

In general, the light absorption behavior of light-protection filter substances is very well known and documented, especially as in most industrial nations there are positive lists for the use of such substances that apply rather strict standards for documentation.

However, the use concentration of known light-protection filter substances present as a solid is frequently limited—particularly in combination with other substances to be dissolved. Obtaining higher light protection factors or UVA protective effect thus presents certain difficulties in terms of the technical formulation.

Advantageous UVA filter substances are hydroxybenzophenones, in particular 2-[4′-(diethylamino)-2′-hydroxybenzoyl]benzoic acid hexyl ester (also: arninobenzophenone) which is characterized by the chemical structural formula:

In order to ensure optimum UV protection, these UV filter substances must be present in dissolved form. Hydroxybenzophenones are characterized by a good light-protection effect. However, their main disadvantage is that they are difficult to dissolve in conventional oil components.

Accordingly, one disadvantage of the prior art is that as a rule only comparatively low light-protection factors could be achieved with these filter substances, since their solubility or dispersibility in the formulations is too low, i.e., they cannot be incorporated into such formulations in a satisfactory manner or only with difficulty.

Even if in principle a certain UV protection can be achieved even with limited solubility, another problem often occurs: recrystallization. In particular substances that are difficult to dissolve recrystallize relatively quickly, which can be caused by temperature fluctuations or other influences. However, uncontrolled recrystallization of an essential preparation component such as a UV filter has extremely disadvantageous effects on the properties of the given preparation and—not least—on the light protection aimed for.

Object of the present invention was to obtain in a simple manner preparations that are characterized by an increased content of hydroxybenzophenones and a correspondingly high UV—in particular UVA—protective effect.

It was surprising and not foreseeable for one of skill in the art that light-protective cosmetic or dermatological preparations, characterized in that they contain

-   -   (a) at least one hydroxybenzophenone and     -   (b) at least one dialkyl naphthalate that is characterized by         the structural formula     -   where R¹ and R² are selected independently of one another from         the group of branched and unbranched alkyl groups with 6 to 24         carbon atoms, overcome the disadvantages of the prior art.

In addition to one or more oil phases, the preparations within the scope of the present invention may preferably in addition contain one or more aqueous phases and be present, e.g., in the form of W/O, O/W, W/O/W or O/W/O emulsions. Such formulations can preferably also be a micro-emulsion, a solids-emulsion (i.e., an emulsion that is stabilized by solids, e.g., a pickering emulsion), a sprayable emulsion or a hydrodispersion.

In every respect the preparations according to the invention represent extremely satisfactory preparations that are not limited to a restricted selection of raw materials. Accordingly they are particularly suitable for use as the basis for forms of preparation with a variety of uses. The preparations according to the invention show very good sensory and cosmetic properties, such as, e.g., spreadability on the skin or the ability to be absorbed into the skin, and are further characterized by very good light-protection effectiveness with simultaneously excellent skin care data.

Subject matter of the invention therefore also is light-protective cosmetic or dermatological preparations, characterized in that they contain synergistic substance combinations of

-   -   (a) at least one hydroxybenzophenone and     -   (b) at least one dialkyl naphthalate that is characterized by         the structural formula     -   where R¹ and R² are selected independently of one another from         the group of branched and unbranched alkyl groups with 6 to 24         carbon atoms,         wherein the UV protective effect, in particular the UVA         protective effect, of these preparations is higher than that of         the same preparations that do not contain any substances         according to (b).

As a rule, the UV protective effect of sunscreen products or the UV filters on which they are based is determined in biological effectiveness tests under standardized conditions. In the sense of the present invention, “UV protective effect” means the protective effect with respect to both UVA radiation and UVB radiation.

Within the scope of the present invention, e.g., the light-protection factor (LSF or SPF) or else IPD values and the like provide a gauge for UV protective effect.

The light-protection factor (LSF, often also called SPF (sun protection factor) indicates the prolongation of the exposure to sunlight that is rendered possible by using the sunscreen product. It is the quotient of erythema threshold time with a sunscreen product and erythema threshold time without a sunscreen product.

The IPD method (IPD=immediate pigment darkening) is normally used to test the UVA protective effect. Like the determination of the light-protection factor, a value is hereby determined that indicates by how much longer the skin protected by the sunscreen product can be irradiated with UVA radiation until the same pigmentation occurs as with unprotected skin.

Another test method that is established throughout Europe is the Australian Standard AS/NZS 2604:1997. The absorption of the preparation in the UVA range is measured thereby. In order to meet the standard, the preparation has to absorb at least 90% of the UVA radiation in the range of 320 to 360 run.

Subject matter of the invention also is

-   -   the use of one or more dialkyl naphthalates that are         characterized by the structural formula     -   where R¹ and R² are selected independently of one another from         the group of branched and unbranched alkyl groups with 6 to 24         carbon atoms to achieve or to increase the solubility of         hydroxybenzophenones.

Further advantageous UVA filter substances are, e.g., dibenzoylmethane derivatives, in particular 4-(tert-butyl)-4′-methoxydibenzoylmethane (CAS No. 70356-09-1) which is sold by Givaudan under the trademark Parsol® 1789 and by Merck under the trade name Eusolex® 9020.

The main disadvantage of all dibenzoylmethane derivatives absorbing in the UV range is a certain instability with respect to UV radiation, so that these components are decomposed into inactive products under UV influence and are no longer available for UV absorption. Prior art preparations with a content of these substances therefore expediently also contain certain UV stabilizers, such as, e.g., ethylhexyl-2-cyano-3,3-diphenylacrylate(octocrylene) or 4-methylbenzylidenecamphor. However, it is often desirable to dispense with the use of such UV stabilizers.

It was surprising and not foreseeable for one of skill in the art that the use of substance combinations of

-   -   (a) at least one hydroxybenzophenone and     -   (b) one or more dialkyl naphthalates that are characterized by         the structural formula     -   where R¹ and R² are selected independently of one another from         the group of branched and unbranched alkyl groups with 6 to 24         carbon atoms         for stabilizing dibenzoylmethane derivatives in cosmetic or         dermatological preparations against decomposition induced by UV         radiation overcome this problem.

It was in particular surprising that with the use according to the present invention it was possible to completely dispense with the use of other UV stabilizers, in particular the use of ethylhexyl-2-cyano-3,3-diphenylacrylate(octocrylene) or 4-methylbenzylidenecamphor.

Hydroxybenzophenones are characterized by the following structural formula:

where

-   -   R¹ and R² independent of one another are hydrogen, C₁-C₂₀-alkyl,         C₃-C₁₀-cycloalkyl or C₃-C₁₀-cyloalkenyl, wherein the         substituents R¹ and R² together with the nitrogen atom to which         they are bound can form a 5- or 6-ring and     -   R³ is a C₁-C₂₀ alkyl radical.

Within the scope of the present invention, a particularly advantageous hydroxybenzophenone is the 2-(4′-diethylamino-2′-hydroxybenzoyl)benzoic acid hexyl ester (also: aminobenzophenone) which is characterized by the following structure:

and is available from BASF under the Uvinul A Plus.

According to the invention, cosmetic or dermatological preparations contain 0.1 to 20% by weight, advantageously 0.1 to 15% by weight, very particularly preferred 0.1 to 10% by weight, of one or more hydroxybenzophenones.

Within the scope of the present invention, dialkyl naphthalates for which R¹ and/or R² represent branched alkyl groups with 6 to 10 carbon atoms are advantageous. Within the scope of the present invention diethylhexyl naphthalate is very particularly preferred which is available, e.g., under the trade name Hallbrite TQ™ from CP Hall or Corapan TQ™ from H&R.

According to the invention cosmetic or dermatological preparations advantageously contain 0.001 to 30% by weight, preferably 0.01 to 20% by weight, very particularly preferred 0.5 to 15% by weight, of one or more dialkyl naphthalates.

The cosmetic or dermatological light-protection formulations according to the invention can be composed as usual and be used for cosmetic or dermatological light-protection, furthermore for the treatment, care and cleansing of the skin and/or hair and as a cosmetic product in decorative cosmetics.

According to their constitution, cosmetic or topical dermatological preparations within the scope of the present invention can be used, e.g., as skin protective cream, cleansing milk, day or night cream, etc. It is optionally possible and advantageous to use the compositions according to the invention as base for pharmaceutical formulations.

For application the cosmetic and dermatological preparations are applied to the skin and/or the hair in sufficient quantity in the manner usual for cosmetics.

The cosmetic and dermatological preparations according to the invention may contain cosmetic auxiliary ingredients, as normally used in such preparations, e.g., preservatives, preservative aids, bactericides, perfumes, substances to prevent foaming, dyes, pigments that have a coloring effect, thickeners, moisturizers and/or humectants, fillers that improve the feel of the skin, fats, oils, waxes or other customary components of a cosmetic or dermatological formulation, such as alcohols, polyols, polymers, foam stabilizers, electrolytes, organic solvents or silicone derivatives.

Advantageous preservatives within the scope of the present invention are, e.g., formaldehyde releasing agents (such as, e.g., DMDM hydantoin which is available, e.g., under the trade name Glydant™ from Lonza), iodopropylbutyl carbamate (e.g., available from Lonza under the trade names Glycacil-L, Glycacil-S and/or Dekaben LMB from Jan Dekker), parabens (i.e., p-hydroxybenzoic acid alkyl esters, such as methyl, ethyl, propyl and/or butyl paraben), phenoxyethanol, ethanol, benzoic acid and the like. Usually the preservative system according to the invention further advantageously also includes preservative aids, such as, e.g., octoxyglycerin, glycine soy, etc.

Particularly advantageous preparations are further obtained if antioxidants are used as additional or active substances. According to the invention, the preparations advantageously contain one or more antioxidants. As favorable antioxidants that are nevertheless to be used optionally, all antioxidants suitable or usual for cosmetic and/or dermatological applications can be used.

Water-soluble antioxidants, such as, e.g., vitamins, e.g., ascorbic acid and its derivatives, may be used particularly advantageously within the scope of the present invention.

Preferred antioxidants are furthermore vitamin E and its derivatives and vitamin A and its derivatives.

The quantity of the antioxidants (one or more compounds) in the preparations is preferably 0.001 to 30% by weight, particularly preferred 0.05 to 20% by weight, in particular 0.1 to 10% by weight, relative to the total weight of the preparation.

If vitamin E and/or its derivatives represent the antioxidant(s), it is advantageous to select their respective concentrations from the range from 0.001 to 10% by weight, relative to the total weight of the formulation.

If vitamin A or vitamin A derivatives or carotenes or their derivatives represent the antioxidant(s), it is advantageous to select their respective concentrations from the range from 0.001 to 10% by weight relative to the total weight of the formulation.

It is in particular advantageous for the cosmetic preparations according to the present invention to contain cosmetic or dermatological active substances, where preferred active substances are antioxidants that can protect the skin from oxidative stress.

Further advantageous active substances within the scope of the present invention are natural active substances and/or their derivatives, such as, e.g., alpha-lipoic acid, phytoen, D-biotin, coenzyme Q10, alpha-glucosylrutin, camitine, camosine, natural and/or synthetic isoflavonoids, creatine, taurine and/or β-alanine.

Formulae according to the invention which contain, e.g., known anti-wrinkle active substances, such as flavone glycosides (in particular α-glycosylrutin), coenzyme Q10, vitamin E and/or derivatives and the like are in particular advantageous for prophylaxis and treatment of cosmetic or dermatological skin changes, such as occur, e.g., with aging of the skin (such as, e.g., dryness, roughness and formation of dryness wrinkles, itching, reduced regreasing (e.g., after washing), visible vasodilatation (telangiectases, cuperosis), flabbiness and the formation of wrinkles and small lines, local hyperpigmentation, hypopigmentation and defective pigmentation (e.g., senile keratoses), increased susceptibility to mechanical stress (e.g., chapping) and the like). They are also advantageously suitable for preventing the appearance of dry or rough skin.

The aqueous phase of the preparations according to the invention can advantageously contain customary cosmetic additives, such as alcohols, in particular those with a low C number, preferably ethanol and/or isopropanol, diols or polyols with a low C number and their ethers, preferably propylene glycol, glycerin, ethylene glycol, ethylene glycol monoethyl ether or ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether or propylene glycol monobutyl ether, diethylene glycol monomethyl ether or diethylene glycol monoethyl ether and analogous products, polymers, foam stabilizers, electrolytes and in particular one or more thickeners which can be advantageously selected from the group silicon dioxide, aluminum silicates, polysaccharides or their derivatives, e.g., hyaluronic acid, xanthan gum, hydroxypropyl methyl cellulose, particularly advantageously from the group of polyacrylates, preferably a polyacrylate from the group of so-called carbopols, e.g., carbopols of types 980, 981, 1382, 2984, 5984, each individually or in combination. Moisturizers can also preferably be used.

Substances or substance mixtures that give cosmetic or dermatological preparations the property after application or distribution on the skin surface of reducing the moisture loss of the horny layer of the epidermis (also called trans-epidermal water loss (TEWL)) and/or favorably influence the hydration of the horny layer of the epidermis, are called moisturizers.

Within the scope of the present invention, advantageous moisturizers are, e.g., glycerin, lactic acid and/or lactates, in particular sodium lactate, butylene glycol, propylene glycol, biosaccharide gum-1, glycine soy, ethylhexyloxyglycerin, pyrrolidone carboxylic acid and urea. It is furthermore advantageous to use polymeric moisturizers from the group of polysaccharides that are water-soluble and/or can be swelled in water and/or can be gelled with the aid of water. Particularly advantageous, e.g., are hyaluronic acid, chitosan and/or a fucose-rich polysaccharide which is filed in the Chemical Abstracts under registration number 178463-23-5 and is available, e.g., under the name Fucogel® 1000 from SOLABIA S.A.

The cosmetic or dermatological preparations according to the invention can further advantageously, although not mandatorily, contain fillers that, e.g., further improve the sensory and cosmetic properties of the formulations and, e.g., cause or intensify a velvety or silky feel of the skin. Advantageous fillers within the scope of the present invention are starch and starch derivatives (such as, e.g., tapioca starch, distarch phosphate, aluminum or sodium starch octenylsuccinate and the like), pigments that neither have mainly a UV filter effect nor have mainly a coloring effect (such as, e.g., boron nitride, etc.) and/or Aerosils® (CAS No. 7631-86-9).

The oil phase of the formulations according to the invention is advantageously selected from the group of polar oils, e.g., from the group of lecithins and fatty acid triglycerides, namely the triglycerin esters of saturated and/or unsaturated branched and/or unbranched alkanecarboxylic acids with a chain length of 8 to 24, in particular 12 to 18 C-atoms. The fatty acid triglycerides can be advantageously selected, e.g., from the group of synthetic, semi-synthetic and natural oils, such as, e.g., cocoglyceride, olive oil, sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palm oil, coconut oil, castor oil, wheat germ oil, grape-seed oil, thistle oil, evening primrose oil, macadamia nut oil and the like.

According to the invention, e.g., natural waxes of animal and plant origin, such as, e.g., beeswax and other insect waxes and berry wax, shea butter and/or lanolin (wool wax) are furthermore advantageous.

Within the scope of the invention, other advantageous polar oil components can further be selected from the group of esters of saturated and/or unsaturated, branched and/or unbranched alkanecarboxylic acids with a chain length of 3 to 30 C-atoms and saturated and/or unsaturated branched and/or unbranched alcohols with a chain length of 3 to 30 C-atoms and from the group of esters of aromatic carboxylic acids and saturated and/or unsaturated, branched and/or unbranched alcohols with a chain length of 3 to 30 C-atoms. Such ester oils can then be advantageously selected from the group octyl palmitate, octyl cocoate, octyl isostearate, octyldodecyl myristate, octyl dodecanol, cetearyl isononanoate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate, isononyl stearate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl laurate, 2-hexyldecyl stearate, 2-octyldodecyl palmitate, stearyl heptanoate, oleyl oleate, oleyl erucate, erucyl oleate, erucyl erucate, tridecyl stearate, tridecyl trimellitate, and synthetic, semi-synthetic and natural mixtures of such esters, such as, e.g., jojoba oil.

Furthermore, the oil phase can advantageously be selected from the group of dialkyl ethers and dialkyl carbonates; e.g., dicaprylyl ether (Cetiol OE) and/or dicaprylyl carbonate, e.g., the one available from Cognis under the trade name Cetiol CC, are advantageous.

It is furthermore preferred to select the oil component(s) from the group isoeicosane, neopentyl glycol diheptanoate, propylene glycol dicaprylate/dicaprate, caprylic/capric/diglyceryl succinate, butylene glycol dicaprylate/dicaprate, C₁₂₋₁₃ alkyl lactate, di-C₁₂₋₁₃ alkyl tartrate, triisostearin, dipentaerythrityl hexacaprylate/hexacaprate, propylene glycol monoisostearate, tricaprylin, dimethyl isosorbide. It is particularly advantageous if the oil phase of the formulations according to the invention has a content of C₁₂₋₁₅ alkyl benzoate or completely consists thereof.

Further advantageous oil components are, e.g., butyl octyl salicylate (e.g., the one available from CP Hall under the trade name Hallbrite BHB), hexadecyl benzoate and butyloctyl benzoate and mixtures thereof (Hallstar AB).

Any desired mixtures of such oil and wax components can also be used advantageously within the scope of the present invention.

Furthermore, the oil phase can likewise advantageously also contain nonpolar oils, e.g., those that are selected from the group of branched and unbranched hydrocarbons and waxes, in particular mineral oil, Vaseline (petrolatum), paraffin oil, squalane and squalene, polyolefins, hydrogenated polyisobutenes and isohexadecane. Among the polyolefins, polydecenes are the preferred substances.

The oil phase can furthermore advantageously have a content of cyclic or linear silicone oils or it can consist completely of such oils, whereby, however, the use of an additional content of other oil phase components, apart from the silicone oil or silicone oils, is preferred.

Silicone oils are high molecular weight synthetic polymeric compounds in which silicon atoms are linked via oxygen atoms in a chain-like or net-like manner and the remaining valences of the silicon are saturated by hydrocarbon radicals (mostly methyl groups, more rarely ethyl groups, propyl groups, phenyl groups, i.a.). The silicone oils are systematically termed polyorganosiloxanes. The methyl-substituted polyorganosiloxanes, which represent the quantitatively most significant compounds of this group and are characterized by the following structural formula.

are also called polydimethylsiloxane or dimethicone (INCI). Dimethicones are available in different chain lengths or with different molecular weights.

Within the scope of the present invention, particularly advantageous polyorganosiloxanes are, e.g., dimethylpolysiloxanes[poly(dimethylsildxane)], which are available, e.g., under the trade names Abil 10 through 10 000 from Th. Goldschmidt. Phenylmethylpolysiloxanes (INCI: phenyl dimethicone, phenyl trimethicone), cyclic silicones (octamethylcyclotetrasiloxane or decam ethylcyclopentasiloxane), which according to the INCI are also called cyclomethicones, amino-modified silicones (INCI: amodimethicone) and silicone waxes, e.g., polysiloxane/polyalkylene copolymers (INCI: stearyl dimethicone and cetyl dimethicone) and dialkoxydimethylpolysiloxanes (stearoxy dimethicone and behenoxy stearyl dimethicone) which are available from Th. Goldschmidt as various Abil wax types, are also advantageous. However, other silicone oils can also be advantageously used within the scope of the present invention, e.g., cetyl dimethicone, hexamethylcyclotrisiloxane, polydimethylsiloxane, poly(methylphenylsiloxane).

Within the scope of the present invention, it is also advantageous to produce cosmetic and dermatological preparations, the main purpose of which is not protection from sunlight, but which nevertheless contain a content of further UV protective substances. Thus UVA or UVB filter substances are usually incorporated, e.g., into day creams or makeup products. UV protective substances, just like antioxidants and, if desired, preservatives, represent an effective protection of the preparations themselves from spoilage. Furthermore, cosmetic and dermatological preparations are favorable that are present in the form of a sunscreen product.

Accordingly, the preparations within the scope of the present invention preferably contain at least one further UVA, UVB and/or broadband filter substance. Although not necessary, the formulations can also optionally contain one or more organic and/or inorganic pigments as UV filter substances which can be present in the aqueous phase and/or the oil phase.

Furthermore, the preparations according to the invention can also advantageously be present in the form of so-called oil-free cosmetic or dermatological emulsions which contain an aqueous phase and at least one UV filter substance liquid at room temperature and/or one or more silicone derivatives as a further phase. Within the scope of, the present invention, oil-free formulations can also advantageously contain further lipophilic components, such as, e.g., lipophilic active substances.

Within the scope of the present invention, particularly advantageous UV filter substances that are liquid at room temperature are homomenthyl salicylate (INCI: homosalate), 2-ethylhexyl-2-cyano-3,3-diphenylacrylate (INCI: octocrylene), 2-ethylhexyl-2-hydroxybenzoate (2-ethylhexyl salicylate, octyl salicylate, INCI: octyl salicylate) and esters of cinnamic acid, preferably 4-methoxycinnamic acid (2-ethylhexyl)ester(2-ethylhexyl-4-methoxycinnamate, INCI: octyl methoxycinnamate) and 4-methoxy cinnamic acid isopentyl ester(isopentyl-4-methoxycinnamate, INCI: isoamyl p-methoxycinnamate).

Preferred inorganic pigments are metal oxides and/or other metal compounds that are hardly soluble or insoluble in water, in particular oxides of titanium (TiO₂), zinc (ZnO), iron (e.g., Fe₂O₃), zirconium (ZrO₂), silicon (SiO₂), manganese (e.g., MnO), aluminum (Al₂O₃), cerium (e.g., Ce₂O₃), mixed oxides of the corresponding metals and mixtures of such oxides and the sulfate of barium (BaSO₄).

Within the scope of the present invention, the pigments can also be used advantageously in the form of commercially available oily or aqueous predispersions. Dispersion aids and/or solubilizers can advantageously be added to these predispersions.

According to the invention the pigments can be advantageously surface-treated (“coated”) whereby, e.g., a hydrophilic, amphiphilic or hydrophobic character is to be formed or should be retained. This surface treatment can consist in providing the pigments with a thin hydrophilic and/or hydrophobic inorganic and/or organic layer according to methods that are known per se. Within the scope of the present invention, the different surface coatings can also contain water.

Inorganic surface coatings within the scope of the present invention can be composed of aluminum oxide (Al₂O₃), aluminum hydroxide Al(OH)₃, or aluminum oxide hydrate (also: alumina, CAS No.: 1333-84-2), sodium hexametaphosphate (NaPO₃)₆, sodium metaphosphate (NaPO₃)_(n) silicon dioxide (SiO₂) (also silica, CAS No.: 7631-86-9) or iron oxide (Fe₂O₃). These inorganic surface coatings can be present individually, in combination and/or in combination with organic coating materials.

Within the scope of the present invention, organic surface coatings can comprise vegetable or animal aluminum stearate, vegetable or animal stearic acid, lauric acid, dimethylpolysiloxane (also: dimethicone), methylpolysiloxane (methicone), simethicone (a mixture of dimethylpolysiloxane with an average chain length of 200 to 350 dimethylsiloxane units and silica gel) or alginic acid. These organic surface coatings can be present individually, in combination and/or in combination with inorganic coating materials.

Zinc oxide particles and predispersions of zinc oxide particles suitable according to the invention are available under the following trade names from the listed companies: Trade Name Coating Manufacturer Z-Cote HP1 2% dimethicone BASF Z-Cote / BASF ZnO NDM 5% dimethicone H&R

Suitable titanium dioxide particles and predispersions of titanium dioxide particles are available under the following trade names from the listed companies: Trade Name Coating Manufacturer MT-100TV Aluminum hydroxide/ Tayca Corporation stearic acid MT-100Z Aluminum hydroxide/ Tayca Corporation stearic acid Eusolex T-2000 Alumina/simethicone Merck KgaA Titandioxid T805 Octyl trimethylsilane Degussa (Uvinul TiO₂) Tioveil AQ 10PG Alumina/silica Solaveil/Uniquema

Further advantageous pigments are latex particles. Latex particles that are advantageous according to the invention are those described in the following documents: U.S. Pat. No. 5,663,213 and EP 0 761 201, respectively. Latex particles that are particularly advantageous are those that are made up of water and styrene/acrylate copolymers and are available, e.g., under the trade name “Alliance SunSphere” from Rohm & Haas.

Advantageous UVA filter substances within the scope of the present invention are dibenzoylmethane derivatives, in particular 4-(tert-butyl)-4′-methoxydibenzoylmethane (CAS No. 70356-09-1) which is sold by Givaudan under the trademark Parsol® 1789 and by Merck under the trade name Eusolex® 9020.

Advantageous further UV filter substances within the scope of the present invention are sulfonated water-soluble UV filters, such as, e.g.:

-   -   Phenylene-1,4-bis(2-benzimidazyl)-3,3′-5,5′-tetrasulfonic acid         and its salts, in particular the corresponding sodium, potassium         or triethanolammonium salts, in particular the         phenylene-1,4-bis(2-benzimidazyl)-3,3′-5,5′-tetrasulfonic         acid-bis-sodium salt with the INCI name bisimidazylate (CAS no.:         180898-37-7) which is available, e.g., under the trade name Neo         Haliopan AP from Haarmann & Reimer;     -   Salts of the 2-phenylbenzimidazole-5-sulfonic acid, such as its         sodium, potassium or triethanolammonium salt, and the sulfonic         acid itself with the INCI name phenylbenzimidazole sulfonic acid         (CAS. No. 27503-81-7) which is available, e.g., under the trade         name Eusolex 232 from Merck or under Neo Heliopan Hydro from         Haarmann & Reimer;     -   1,4-di(2-oxo-10-sulfo-3-bomylidenemethyl)benzene (also:         3,3′-(1,4-phenylene-dimethylene)-bis(7,7-dimethyl-2-oxo-bicyclo-[2.2.1]hept-1-ylmethane-sulfonic         acid) and its salts (in particular the corresponding 10-sulfato         compounds, in particular the corresponding sodium, potassium or         triethanolammonium salt), which is also known as         benzene-1,4-di(2-oxo-3-bornylidenemethyl-10-sulfonic acid).         Benzene-1,4-di(2-oxo-3-bornylidenemethyl-10-sulfonic acid) has         the INCI name terephthalidene dicamphorsulfonic acid. (CAS.-No.         90457-82-2) and is available, e.g., under the trade name Mexoryl         SX from Chimex;     -   Sulfonic acid derivatives of 3-benzylidenecamphor, such as,         e.g., 4-(2-oxo-3-bornylidenemethyl)benzenesulfonic acid,         2-methyl-5-(2-oxo-3-bornylidene-methyl)sulfonic acid and their         salts.

Advantageous UV filter substances within the scope of the present invention are furthermore so-called broadband filters, i.e., filter substances which absorb both UVA and UVB radiation.

Advantageous broadband filters or UVB filter substances are, e.g., triazine derivatives, such as, e.g.:

-   -   2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine         (INCI: methylene bis-benzotriazole methylbutylphenol), which is         available under the trade name Tinosorb® S from CIBA-Chemikalien         GmbH;     -   Dioctylbutylamidotriazone (INCI: diethylhexyl butamidotriazone),         which is available under the trade name UVASORB HEB from Sigma         3V;     -   4,4′,4″-(1,3,5-triazine-2,4,6-triyltriimino)-tris-benzoic         acid-tris(2-ethylhexyl ester), also:         2,4,6-tris[anilino-(p-carbo-2′-ethyl-1′-hexyloxy)]-1,3,5-triazine         (INCI: octyl triazone), which is sold by BASF Aktiengesellschaft         under the trade name UVINUL® T 150.

Within the scope of the present invention, an advantageous broadband filter is also 2,2′-methylene-bis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol), (INCI: bisoctyltriazole) which is available under the trade name Tinosorb® M from CIBA-Chemikalien GmbH.

An advantageous broadband filter within the scope of the present invention is also 2-(2H-benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethyl-silyl)oxy]disiloxanyl]propyl]phenol (CAS -No. 155633-54-8) with the INCI name of drometrizole trisiloxane.

The further UV filter substances can be oil-soluble. Advantageous oil-soluble filter substances are, e.g.:

-   -   3-benzylidenecamphor derivatives, preferably         3-(4-methylbenzylidene)camphor, 3-benzylidenecamphor;     -   4-aminobenzoic acid derivatives, preferably (2-ethylhexyl)         4-(dimethylamino)benzoate, amyl 4-(dimethylamino)benzoate;     -   Derivatives of benzophenone, preferably         2-hydroxy-4-methoxybezophenone,         2-hydroxy-4-methoxy-4′-methylbenzophenone,         2,2′-dihydroxy-4-methoxy-benzophenone,     -   (3-(4-(2,2-bis         ethoxycarbonylvinyl)phenoxy)propenyl)methylsiloxane-/dimethyl-siloxane         copolymer which is available, for example, under the trade name         Parsol SLX® from Hoffmann La Roche,     -   and UV filters bound to polymers.

A further light protection filter substance which can be used advantageously according to the invention is ethylhexyl-2-cyano-3,3-diphenyl acrylate(octocrylene), which is available from BASF under the name Uvinul® N 539.

Particularly advantageous preparations within the scope of the present invention that are characterized by a high or very high UVA protection, preferably contain in addition to the filter substance(s) according to the invention furthermore further UVA and/or broadband filters, in particular dibenzoylmethane derivatives [e.g., 4-(tert-butyl)-4′-methoxydibenzoylmethane] and/or 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, each individually or in any combination with one another.

Of course, the list of specified UV filters that can be used within the scope of the present invention is not intended to be limiting.

The preparations according to the invention advantageously contain the substances that absorb UV radiation in the UVA and/or UVB range, in a total amount of, e.g., 0.1% by weight to 30% by weight, preferably 0.5 to 20% by weight, in particular 1.0 to 15.0% by weight, each relative to the total weight of the preparations, in order to provide cosmetic preparations that protect the hair or the skin from the entire range of ultraviolet radiation.

Furthermore, it can optionally be advantageous to incorporate film-formers into the cosmetic or dermatological preparations according to the invention, e.g., in order to improve the hygrostability of the preparations or to increase the UV protective effect (UVA and/or UVB boosting). Water-soluble or dispersible as well as fat-soluble film-formers are suitable, each individually or in combination with one another.

Advantageous water-soluble or dispersible film-formers are, e.g., polyurethanes (e.g., the Avalure® types from Goodrich), dimethicone copolyol polyacrylate (Silsoft Surface® from the Witco Organo Silicones Group), PVP/NVA (VA=vinyl acetate) copolymer (Luviscol VA 64 Powder from BASF), etc.

Advantageous fat-soluble film-formers are, e.g., the film-formers from the group of polymers based on polyvinylpyrrolidone (PVP)

Copolymers of polyvinylpyrrolidone are particularly preferred, e.g., the PVP hexadecene copolymer and the PVP eicosene copolymer, which are available under the trade names Antaron V216 and Antaron V220 from GAF Chemicals Corporation, and Tricontayl PVP, and the like.

The following examples are to illustrate the present invention without limiting it. The numbers in the examples refer to percentages by weight relative to the total weight of the respective preparations.

EXAMPLES

1. O/W Sunscreen Emulsions 1 2 3 4 5 6 7 Glycerin monostearate SE 0.50 1.00 3.00 1.50 Glyceryl stearate citrate 2.00 1.00 2.00 4.00 Stearic acid 3.00 2.00 PEG-40 stearate 0.50 2.00 Cetyl phosphate 1.00 Cetearyl sulfate 0.75 Stearyl alcohol 3.00 2.00 0.50 Cetyl alcohol 2.50 1.00 1.50 0.50 2.00 Aminobenzophenone 2.00 1.50 0.75 1.00 2.00 4.50 5.00 Ethylhexyl 5.00 6.00 8.00 methoxycinnamate Bis-ethylhexyloxyphenol 1.50 2.00 2.50 2.50 methoxyphenyl triazine Butyl 2.00 2.00 1.50 methoxydibenzoylmethane Disodium phenyl- 2.50 0.50 2.00 0.30 dibenzimidazole tetrasulfonate Ethylhexyl triazone 4.00 3.00 4.00 2.00 Octocrylene 4.00 7.50 Diethylhexyl butamido 1.00 2.00 1.00 1.00 triazone Phenylbenzimidazole 0.50 3.00 sulfonic acid Methylene bis- 2.00 0.50 1.50 2.50 benzotriazolyl tetramethylbutyl phenol Ethylhexyl salicylate 3.00 5.00 Drometrizole trisiloxane 0.5 1.00 Terephthalidene 1.50 1.00 0.50 dicamphorsulfonic acid Diethylhexyl-2,6- 3.50 4.00 7.00 9.50 6.70 5.50 10.00 naphthalate Titanium dioxide MT-100Z 1.00 3.00 2.00 1.50 Zinc oxide HP1 0.25 2.00 C12-15 Alkyl benzoate 2.50 4.00 7.00 Dicaprylyl ether 3.50 2.00 Butylene glycol 5.00 6.00 dicaprylate/dicaprate Dicaprylyl carbonate 6.00 2.00 Cocoglycerides 4.50 7.50 3.00 Dimethicone 0.50 1.00 2.00 Cyclomethicone 2.00 0.50 0.50 Shea butter 2.00 PVP hexadecene 0.50 0.50 1.00 1.00 copolymer Glycerin 3.00 7.50 7.50 5.00 2.50 Xanthan gum 0.15 0.05 0.30 Sodium carbomer 0.20 0.10 0.20 Vitamin E acetate 0.50 0.25 0.75 1.00 Fucogel ® 1000 3.50 10.00 Glycine soy 0.50 1.50 1.00 Ethylhexyl oxyglycerin 0.35 0.75 DMDM hydantoin 0.60 0.40 0.20 Glycacil -L ® 0.18 0.20 Methylparaben 0.15 0.25 0.50 Phenoxyethanol 1.00 0.40 0.40 0.50 0.40 Trisodium EDTA 0.02 0.05 Iminodisuccinic acid 0.25 1.0 Ethanol 2.00 1.50 3.00 4.50 5.00 Perfume 0.10 0.20 0.35 0.40 0.20 Water ad 100 ad 100 ad 100 ad 100 ad 100 ad 100 ad 100

2. Hydrodispersions 1 2 3 4 5 Ceteareth-20 1.00 0.5 Cetyl alcohol 1.00 Sodium carbomer 0.20 0.30 Acrylates/C10-30 alkyl 0.50 0.40 0.10 0.50 acrylate crosspolymer Xanthan gum 0.30 0.15 0.50 Aminobenzophenone 2.50 3.00 1.00 0.50 1.50 Ethylhexyl methoxycinnamate 5.00 8.00 Bis-ethylhexyloxyphenol 1.50 2.00 2.50 methoxyphenyl triazine Butyl 0.50 3.00 2.50 methoxydibenzoylmethane Disodium phenyl- 0.50 3.00 dibenzimidazole tetra- sulfonate Ethylhexyl triazone 4.00 3.00 1.00 Octocrylene 4.00 3.90 6.50 Diethylhexyl 1.00 2.00 butamidotriazone Phenylbenzimidazole sulfonic 0.50 3.00 acid Methylene bis-benzotriazolyl 2.50 0.50 tetramethylbutyl phenol Drometrizole trisiloxane 1.00 1.50 Terephthalidene 0.50 1.00 dicamphorsulfonic acid Diethylhexyl-2,6-naphthalate 10.00 8.00 7.50 5.50 9.80 Titanium dioxide MT-100TV 0.50 2.00 1.00 Zinc oxide HP1 1.00 2.00 3.00 C12-15 Alkyl benzoate 2.00 2.50 Dicaprylyl ether 4.00 Butyleneglycol 4.00 2.00 6.00 dicaprylate/dicaprate Dicaprylyl carbonate 2.00 6.00 Dimethicone 0.50 1.00 Phenyl trimethicone 2.00 0.50 Shea butter 2.00 5.00 PVP hexadecene copolymer 0.50 0.50 1.00 Tricontanyl PVP 0.50 1.00 Ethylhexyl glycerin 1.00 0.80 Glycerin 3.00 7.50 7.50 8.50 Glycine soy 1.50 1.00 Vitamin E acetate 0.50 0.25 1.00 Alpha-glucosilrutin 0.60 0.25 Fucogel ® 1000 2.50 0.50 2.00 DMDM hydantoin 0.60 0.40 0.20 Glycacil-S ® 0.20 Methylparaben 0.50 0.25 0.15 Phenoxyethanol 0.50 0.40 1.00 Trisodium EDTA 0.01 0.05 0.10 Ethanol 3.00 2.00 1.50 7.00 Perfume 0.20 0.05 0.40 Water ad 100 ad 100 ad 100 ad 100 ad 100

3. W/O Sunscreen Emulsions 1 2 3 4 5 Cetyl dimethicone 2.50 4.00 copolyol Polyglyceryl-2- 5.00 4.50 dipolyhydroxystearate PEG-30- 5.00 dipolyhydroxystearate Aminobenzophenone 3.50 4.00 5.00 1.50 0.25 Ethylhexyl 8.00 5.00 4.00 methoxycinnamate Bis- 2.00 2.50 2.00 2.50 ethylhexyloxyphenol methoxyphenyl triazine Butyl methoxy- 1.50 0.70 dibenzoylmethane Disodium phenyl 1.00 2.00 2.00 dibenzimidazole tetrasulfonate Ethylhexyl triazone 3.00 4.00 Octocrylene 10.00 7.50 2.50 Diethylhexyl butamido 1.00 2.00 triazone Phenylbenzimidazole 0.50 3.00 2.00 sulfonic acid Methylene bis- 0.50 2.00 benzotriazolyl tetramethylbutyl phenol Drometrizole 1.00 1.50 trisiloxane Terephthalidene 1.00 0.50 dicamphorsulfonic acid Diethylhexyl-2,6- 7.50 5.50 6.00 10.00 15.00 naphthalate Titanium dioxide T805 2.00 3.00 Titanium dioxide MT-100Z 1.50 Zinc oxide Z-Cote HP1 1.00 8.00 2.00 Mineral oil 12.00 10.0 8.00 C12-15 Alkyl 9.00 benzoate Dicaprylyl ether 10.00 7.00 Butylene glycol 2.00 8.00 4.00 dicaprylate/dicaprate Dicaprylyl carbonate 5.00 6.00 Dimethicone 4.00 1.00 5.00 Cyclomethicone 2.00 25.00 2.00 Shea butter 3.00 Vaseline 4.50 PVP hexadecene 0.50 0.50 1.00 copolymer Ethylhexyl glycerin 0.30 1.00 0.50 Glycerin 3.00 7.50 7.50 8.50 Glycine soy 1.00 1.50 1.00 MgSO₄ 1.00 0.50 0.50 MgCl₂ 1.00 0.70 Vitamin E acetate 0.50 0.25 1.00 Ascorbyl palmitate 0.50 2.50 Fucogel ®1000 3.50 7.50 DMDM hydantoin 0.60 0.40 0.20 Methylparaben 0.50 0.25 0.15 Phenoxyethanol 0.50 0.40 1.00 Trisodium EDTA 0.12 0.05 0.30 Ethanol 3.00 1.50 5.00 Perfume 0.20 0.40 0.35 Water ad 100 ad 100 ad 100 ad 100 ad 100

4. Solids-stabilized Emulsions 1 2 3 4 5 Mineral oil 16.0 16.0 Octyldodecanol 9.0 9.0 5.0 Caprylic/capric triglyceride 9.0 9.0 6.0 C-12-15 Alkyl benzoate 5.0 8.0 Butylene glycol 8.0 dicaprylate/dicaprate Dicaprylyl ether 9.0 4.0 Dicaprylyl carbonate 9.0 Hydroxyoctacosanyl 2.0 2.0 2.0 2.0 1.5 hydroxystearate Disteardimonium hectorite 1.0 0.75 0.5 0.25 Cera Microcristallina + 0.35 5.0 Paraffinum Liquidum Hydroxypropyl methyl 0.1 0.05 cellulose Dimethicone 3.0 Aminobenzophenone 3.0 5.0 1.5 5.5 0.75 Butyl 0.5 3.50 0.5 methoxydibenzoylmethane Ethylhexyl 6.0 3.0 methoxycinnamate Diethylhexyl butamido 2.0 4.0 triazone Ethylhexyl triazone 2.0 1.5 4.0 Octocrylene 7.5 10.0 Methylene bis- 0.5 2.0 benzotriazolyl tetramethylbutyl phenol Drometrizole trisiloxane 0.5 1.0 Terephthalidene dicamphor- 1.0 0.5 1.50 sulfonic acid Disodium phenyl 2.50 3.1 dibenzimidazole tetrasulfonate Titanium dioxide + alumina + 2.0 4.0 2.0 4.0 simethicone + aqua Titanium dioxide + 4.0 3.0 trimethoxycaprylylsilane Zinc oxide Z-Cote HP1 2.5 6.0 Silica dimethyl silylate 1.0 Boron nitride 2.0 Starch/sodium 0.5 metaphosphate polymer Diethylhexyl-2,6- 5.0 7.0 8.5 3.0 4.5 naphthalate Tapioca starch 1.0 Sodium chloride 1.0 1.0 1.0 1.0 1.0 Glycerin 5.0 10.0 3.0 6.0 10.0 Trisodium EDTA 1.0 1.0 1.0 Methylparaben 0.2 Propylparaben Phenoxyethanol 0.4 0.4 0.5 Hexamidine diisethionate 0.08 Diazolidinyl urea 0.28 0.28 Alcohol 5.0 2.5 Perfume 0.25 0.4 0.1 Water ad 100 ad 100 ad 100 ad 100 ad 100

5. Sticks 1 2 3 4 Caprylic/capric 12 10 6 triglyceride Octyldodecanol 7 14 8 3 Butylene glycol 12 dicaprylate/dicaprate Pentaerythrityl 10 6 8 7 tetraisostearate Polyglyceryl-3 2.5 diisostearate Bis-diglyceryl 9 8 10 8 polyacyladipate-2 Cetearyl alcohol 8 11 9 7 Myristyl myristate 3.5 3 4 3 Beeswax 5 5 6 6 Cera carnauba 1.5 2 2 1.5 Cera alba 0.5 0.5 0.5 0.5 C16-40 Alkyl 1.5 1.5 1.5 stearate Diethylhexyl-2,6- 5.5 13.0 2.5 8.0 naphthalate Aminobenzophenone 2.0 5.5 1.0 0.5 Butyl 1 1 methoxydibenzoylmethane Z-Cote ® HP1 4.5 MT-100 TV 4 2.5 Titanium dioxide T 805 3.6 5 Ethylhexyl 3 3.6 2.5 methoxycinnamate Bis-ethylhexyloxyphenol 2.5 5 methoxyphenyl triazine Octocrylene 7.5 Benzophenone-3 3.5 Ethylhexyl triazone 2 Diethylhexyl 3 butamido triazone Tocopheryl acetate 0.5 1 Ascorbyl palmitate 0.05 0.05 Buxus Chinensis 2 1 1 Perfume, BHT 0.1 0.25 0.35 Ricinus Communis ad 100 ad 100 ad 100 ad 100

5. PIT Emulsions 1 2 3 4 5 6 7 8 Glycerin 0.50 2.00 3.00 5.00 0.50 4.00 monostearate SE Glyceryl isostearate 3.50 4.00 2.00 Isoceteth-20 0.50 2.00 Ceteareth-12 5.00 1.00 3.50 Ceteareth-20 2.00 2.50 3.00 PEG-100 stearate 5.00 1.00 1.00 0.50 Cetyl alcohol 2.50 1.00 1.50 0.50 1.50 Cetyl palmitate 0.50 1.00 Cetyl dimethicone 0.50 0.50 1.00 copolyol Polyglyceryl-2 0.75 0.25 Dipolyhydroxy stearate Diethylhexyl-2,6- 7.00 3.50 8.00 6.00 15.0 4.00 5.00 4.50 naphthalate Aminobenzophenone 2.00 3.00 1.00 1.50 5.00 3.00 0.75 2.50 Bis-ethylhexyl- 0.50 2.00 3.00 oxyphenol methoxy- phenyl triazine Butyl methoxy- 1.50 1.00 5.00 1.00 0.75 dibenzoylmethane Disodium phenyl 2.00 1.00 dibenzimidazole tetrasulfonate Terephthalidene 0.50 1.00 dicamphor sulfonic acid Drometrizole 2.00 3.00 1.00 trisiloxane Ethylhexyl 8.00 4.50 5.00 8.00 methoxycinnamate Ethylhexyl salicylate 4.00 3.50 4.00 Dioctyl butamido 3.00 2.00 2.00 1.50 triazone Ethylhexyl triazone 2.00 4.00 1.50 3.00 Dimethicone 4.50 3.50 diethylbenzalmalonate Octocrylene 5.00 8.00 10.0 7.50 Phenylbenzimidazole 1.00 5.00 3.00 sulfonic acid C12-15 Alkyl 3.50 6.50 benzoate Cocoglycerides 3.00 3.00 3.50 Dicaprylyl ether 4.00 Butylene glycol 4.00 3.00 dicaprylate/dicaprate Dicaprylyl carbonate 0.50 6.00 Dibutyl adipate 2.50 1.00 Phenyltrimethicone 2.00 3.00 Cyclomethicone 3.00 4.00 Ethyl galactomannan 0.50 2.00 (N-Hance ® AG-200) Hydrogenated 3.00 4.00 2.50 cocoglycerides Abil ® Wax 2440 1.50 3.00 PVP hexadecene 1.00 1.50 copolymer Glycerin 10.0 5.00 7.50 10.00 Fucogel ®1000 2.50 6.00 Tocopherol 1.00 0.75 0.50 1.00 Shea butter 2.00 3.50 0.50 Iodopropyl butyl- 0.12 0.20 carbamate DMDM hydantoin 0.10 Methylparaben 0.50 0.25 0.45 Phenoxyethanol 0.50 0.40 1.00 1.00 Octoxyglycerin 0.30 1.00 0.35 Ethanol 2.00 6.00 7.50 4.00 Trisodium EDTA 0.40 0.15 0.20 0.50 Perfume 0.20 0.20 0.20 0.45 0.20 Water ad 100 ad 100 ad 100 ad 100 ad 100 ad 100 ad 100 ad 100 

1. Light-protective cosmetic or dermatological preparations, characterized in that they contain (a) at least one hydroxybenzophenone and (b) at least one dialkyl naphthalate that is characterized by the structural formula

where R¹ and R² are selected independently of one another from the group of branched and unbranched alkyl groups with 6 to 24 carbon atoms.
 2. Light-protective cosmetic or dermatological preparations, characterized in that they contain synergistic substance combinations of (a) at least one hydroxybenzophenone and (b) at least one dialkyl naphthalate that is characterized by the structural formula

where R¹ and R² are selected independently of one another from the group of branched and unbranched alkyl groups with 6 to 24 carbon atoms, wherein the UV protective effect, in particular the UVA protective effect, of these preparations is higher than that of the same preparations that do not contain any substances according to (b).
 3. Preparation according to claim 1, characterized in that the content of one or more dialkyl naphthalates is selected from the range of from 0.001 to 30% by weight, preferably 0.01 to 20% by weight, very particularly preferred 0.5 to 15% by weight, relative to the total weight of the preparation.
 4. Preparation according to claim 1, characterized in that it contains at least one further UV filter substance, selected from the group triazines, benzotriazoles, liquid UV filter substances and organic and/or inorganic pigments.
 5. Preparation according to claim 1, characterized in that it contains at least one further UVA filter substance and/or a broadband filter, selected from the group dibenzoylmethane derivatives [in particular 4-(tert.-butyl)-4′-methoxydibenzoylmethane] and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, wherein the further filter substances can be present each individually or in any desired combination with one another.
 6. Preparation according to claim 1, characterized in that it contains at least one flavone glycoside, in particular α-glucosylrutin, and/or vitamin E and/or derivatives thereof.
 7. Use of preparations according to claim 1 for moistening the skin.
 8. Use of preparations according to claim 1 for protecting against light-related aging of the skin.
 9. Use of one or more dialkyl naphthalates that are characterized by the structural formula

where R¹ and R² are selected independently of one another from the group of branched and unbranched alkyl groups with 6 to 24 carbon atoms, to achieve or increase the solubility of hydroxybenzophenones.
 10. Use of substance combinations of (a) at least one hydroxybenzophenone and (b) one or more dialkyl naphthalates that are characterized by the structural formula

where R¹ and R² are selected independently of one another from the group of branched and unbranched alkyl groups with 6 to 24 carbon atoms, for stabilizing dibenzoylmethane derivatives in cosmetic or dermatological preparations against the decomposition that is induced by UV radiation. 